HWS
|
The Hot Water System specifications are set here.
- DHW
system - Up to 20 different DHW systems can be defined. Each room
is associated with a DHW system. Each DHW system has a set of data to define
the system.
- Description –
Each DHW system has a unique name.
- Generator
type – Select the type of DHW generator, this selection includes
using the same heat generator as the heating system.
- Fuel
type – Select the Fuel type from list.
- Later
than 1988 – For boiler systems installed from 1998 onwards, a
default seasonal efficiency of 0.81 is suggested by the tool (based on
Statutory Instrument 1994 No. 3083), and for boiler systems installed before
this period, a conservative default seasonal efficiency of 0.65 is suggested.
Please note that from around 1989, the boiler industry began producing boilers
with efficiencies that would have complied with the above statutory instrument.
- Generator
seasonal efficiency – The generator seasonal efficiency can be
specified, or a default value can be used.
Storage system – A hot water
storage system can be specified. If the Storage volume (litres) and the Storage
losses (MJ/month) are known, they can defined, otherwise a default will be
used.
Secondary circulation – If
there is secondary circulation with the DHW system it can be specified. If the
Circulation losses (W/m), Pump power (kW) and the pipe Loop length (metres) are
known, they can be defined, otherwise a default will be used. Time control can
also be specified for the secondary circulation.
If the Storage system or the Secondary circulation
system are set to use defaults, the program will fill in the data based on the
defaults used by SBEM.
The
Bi-valent systems section allows a
bivalent HWS system to be setup. This is when the heating is supplied by two or
more different types of heat sources.
|
SES
|
The Solar Energy System specifications are set
here.
- System - Up to
20 different SES systems can be defined. The following data must be defined for
each SES system.
- DHW
system - Each SES system must be designated to a DHW system so that
the specific energy saving due to solar power can be correctly counted.
- Description –
Each SES system has a unique name.
- Area – Solar
panel area (m2)
- Inclination –
Select nearest inclination angle from the list.
- Orientation –
Select the nearest orientation from the list.
- Multiplier –
Several identical solar panels can be specified, all being designated to the
DHW system.
|
Wind generator, PVS and Solar Collectors
|
The
Wind generator specifications are set
here.
- System - Up to
20 different wind generators can be defined. Each wind generator has a set of
data associated with it.
- Description -
Each wind generator has a unique name.
- Terrain
type - Indicates the type of terrain around the generator.
- Power - Used to
define delivered electrical power at rated wind speed.
- Hub
height - Used to enter turbine hub height.
- Multiplier -
Several identical wind generators can be specified.
The
Swept area of the wind turbine is used to
calculate the area of air intercepted by the turbine rotor.
- Axial horizontal
wind turbines, enter the rotor diameter in m. The swept area is automatically
calculated as the area of the circle delineated by the turbine's blades.
- For any other type
of wind turbines including vertical axis wind turbines enter the turbine rotor
swept area, in m².
The
Transpired Solar collectors contains
already defined solar collectors, assigned if the room is served by solar
collectors.
The
Photo-voltaic systems
specifications are set here.
- System
- Up to 20 different PVS systems can be defined.
Each PVS system has a set of data associated with it.
- Description –
Used to define name. Each PVS system has a unique name.
- Type – Used to
select the type of module technology used in this PV panel.
- Area – Used to
enter Photovoltaic panel area, excluding the supporting construction.
- Inclination –
Select nearest inclination angle from the list.
- Orientation
–Select the nearest orientation from the list.
- Multiplier –
Several identical photovoltaic panels can be specified, all being designated to
the DHW system.
|
CHP, District Heating and Air Conditioning
|
CHP generator - If the System
uses CHP check box has been checked for the heating system, CHP generator data
can be defined. The following data is defined for a CHP generator.
-
Fuel type – Select from the list.
-
Heat efficiency – Used to enter value of
the heat efficiency of the CHP generator.
- Electrical
efficiency – Used to enter value of the electrical efficiency of
the CHP generator.
- Building
space heat supplied – Used to enter value of the proportion of
space heating supplied to the building by the CHP generator (%).
- Building
hot water supplied – Used to enter value of the proportion of DHW
supplied to the building by the CHP generator (%).
- CHPQA
quality index – Used to enter value of the annual useful heat
supplied by the CHP generator divided by the annual electricity generated
(ratio).
Air conditioning inspection
- This data is used for reporting purposing and is not used in the calculation.
If the
Building has an air conditioning system
the following can be entered:
-
A/c rating - If this is know it can be
entered otherwise the estimated rating should be set.
- Estimated
rating – If the actual rating is unknown then an estimated range
should be set.
- Inspection
status – The current status of the air conditioning inspection
should be specified.
District heating
- The CO2 emission factor for district
heating should reflect the average annual efficiency and fuel mix of the whole
district heating system. It should include all heat generating plant, including
any CHP, any waste heat recovery or heat dumping, the effect of heat losses in
distribution (external to the building), the emissions from electricity used
for pumping, and any other relevant carbon dioxide emissions. This option is
only available if district heating has been selected on any of the currently
selected HVAC system.
|
Other
|
Power factor and Lighting
controls
- Electric
power factor – This is a measure of the actual electric power
consumption to that usually measured by the electric metre.
- Lighting
control – This gives a 5% controls correction to the lighting
system is both options are specified.
Ground floor U values - If
the U value of the ground floors have been modified in accordance to BR
443:2006, this needs to be specified. If the U values have not been modified
then SBEM will perform the modification.
Centre lines - Typically DDB
rooms are entered using the internal edge of all room surfaces. The NCM
modelling guide defines the floor area of the zone to be calculated using the
internal horizontal dimensions between the internal surfaces of the external
zone walls and half-way through the thickness of the internal zone walls.
Selecting this option will prevent this program from
adjusting the room area to account for the thickness of the partition surfaces.
|